The Atom LT Vest is versatile as both a midlayer or a standalone, but it is also a proven performer across a range of seasons, landscapes and activities. The latest iteration of this classic packs the most advanced insulation, fabrics, and design, while building on its legendary performance. The insulation retains warmth if wet and withstands years of packing and unpacking, and is resistant to wind and light weather. Stretch fleece side panels aid ventilation and freedom, and the entire vest packs into its own pocket.